Simms, who no longer speaks to Spears following a fall-out in 2008, wed Forstmann in the Sky Villa at the Palms Casino Resort's Fantasy Tower. The pair, both 28, met through mutual friend Adrienne Maloof, who appears on "The Real Housewives of Beverly Hills." The newlyweds, who now live in Baton Rouge, Louisiana, have been together for more than two-and-a-half years, and got engaged just this month.

"Alli wanted a quiet wedding, with her family and close friends," says a source. "It was about 100 guests, and very intimate."

A source says Spears' dad Jamie, as well as her boyfriend Jason Trawick are both aware of the marriage and pregnancy, but there have been no well-wishes from Spears. "It breaks her heart, because she trully loves Britney," says the source. "But she is happy she is no longer part of the Spears drama, although she does miss Britney."

Adds the source, "All that matters to Alli now is her husband, and becoming a mother."